I never used iMessage Audio during the beta phase because I didn't find it as practical on an iPad, but now having my iPhone again this PTT-like system seems to be both an efficient and fun way to communicate with people. However, I noticed during the keynote the audio sounded very high quality, like the person was speaking into a live mic almost. However, using it on my iPhone 6, it sounds like I'm on a standard phone call, that is to say VERY low quality. Is this how audio on iMessage is supposed to sound? It's still very usable but I was hoping it would be like the stage demo, not like a phone call.